Radius Tooth Belt - 26.8 x 1/2 85 Teeth

The Radius Tooth Belt - 26.8 x 1/2 85 Teeth is a precision HTD (High Torque Drive) synchronous belt engineered for demanding engine accessory drive applications. Manufactured by MOROSO, a trusted name in performance engine components, this belt is designed to reliably transfer power from crankshaft pulleys to alternators, water pumps, and supercharger systems. The 85-tooth configuration and 8 mm pitch provide consistent engagement and predictable power delivery in high-performance and street rod applications where stock belts fall short of reliability demands.

HTD tooth profile belts like this radius design eliminate slip and belt noise through positive drive mechanics—each tooth seats fully into corresponding pulley grooves, preventing the creep and wear common to V-belts. The 26.8-inch length and 1/2-inch width accommodate compact pulley arrangements while the precise 8 mm pitch ensures compatibility with standard HTD pulley systems. MOROSO's manufacturing maintains strict tolerances and uses reinforced synthetic materials to withstand continuous high-rpm operation and thermal cycling without degradation, making this belt suitable for both naturally aspirated and forced-induction engine builds.

This belt is ideal for custom engine builders, street rod enthusiasts, and performance technicians upgrading factory accessory drive systems to support increased demand from upgraded alternators or superchargers. Installation requires HTD pulley sets matching the 8 mm pitch and 1/2-inch width; verify existing pulley dimensions before purchase to ensure proper alignment and tension. The lightweight design (0.16 lbs) minimizes rotating mass, reducing parasitic drag and improving overall engine efficiency in competition and daily-driver applications alike.